Fix TortuosityMLMG build: add missing cell_active constant

[jameslehoux]

cell_active is defined as a file-local constexpr in TortuositySolverBase.cpp and is not visible from TortuosityMLMG.cpp. Add a local definition.

[github-actions]

Performance Benchmark Results

Size	Solver	Wall Time (s)	Tortuosity	Expected	Rel. Error	Iters	Status
64³	pcg	0.6265	0.984375	0.984375	0.00e+00	1	PASS
64³	flexgmres	0.3889	0.984375	0.984375	0.00e+00	N/A	PASS
64³	bicgstab	0.3782	0.984375	0.984375	0.00e+00	N/A	PASS
64³	gmres	0.3818	0.984375	0.984375	0.00e+00	N/A	PASS
64³	pfmg	N/A	N/A	0.984375	N/A	N/A	FAIL
64³	mlmg	N/A	N/A	0.984375	N/A	N/A	FAIL
128³	pcg	7.6331	0.992188	0.992188	0.00e+00	1	PASS
128³	flexgmres	5.3214	0.992188	0.992188	0.00e+00	N/A	PASS
128³	bicgstab	5.2291	0.992188	0.992188	0.00e+00	N/A	PASS
128³	gmres	5.2379	0.992188	0.992188	0.00e+00	N/A	PASS
128³	pfmg	N/A	N/A	0.992188	N/A	N/A	FAIL
128³	mlmg	N/A	N/A	0.992188	N/A	N/A	FAIL

Fastest solver: bicgstab at 64³ (0.3782s)
Warning: Some solvers failed to converge.

Benchmark: uniform block (analytical τ = (N-1)/N)

[github-actions]

Code Coverage Report

------------------------------------------------------------------------------
                           GCC Code Coverage Report
Directory: .
------------------------------------------------------------------------------
File                                       Lines     Exec  Cover   Missing
------------------------------------------------------------------------------
src/io/CathodeWrite.cpp                       95       83    87%   40-41,97-100,115-116,182-185
src/io/CathodeWrite.H                          1        1   100%
src/io/DatReader.cpp                         135      105    77%   26-27,30,35,92-93,99-100,107-109,135-137,141,144-148,152-155,162,164,208-209,242,245
src/io/DatReader.H                             1        1   100%
src/io/HDF5Reader.cpp                        344       84    24%   40-41,43-44,46-49,52,54-56,58-59,62,64-66,68-74,92-93,126-128,144-145,154-157,174-180,182-187,204,213-215,217,219-228,230-233,236-238,240-251,253-258,266,266,266,266,266,266,266,270,270,270,270,270,270,270,274,276,278,280,282,288,290,297,297,297,297,297,297,297,301,301,301,301,301,301,301,305,305,305,305,305,305,305-306,306,306,306,306,306,306,309,309,309,309,309,309,309-310,310,310,310,310,310,310-311,311,311,311,311,311,311,313,313,313,313,313,313,313-314,314,314,314,314,314,314-315,315,315,315,315,315,315,319,319,319,319,319,319,319,324,324,324,324,324,324,324-325,325,325,325,325,325,325-326,326,326,326,326,326,326-327,327,327,327,327,327,327,332,332,332,332,332,332,332,337,337,337,337,337,337,337-338,338,338,338,338,338,338,343,343,343,343,343,343,343,350,350,350,350,350,350,350,357-358,432-435,437-440
src/io/HDF5Reader.H                            3        3   100%
src/io/ImageLoader.cpp                        61       42    68%   25,38,48,60-62,64-70,72,77,89-90,92,94
src/io/RawReader.cpp                         266      135    50%   49-50,89-90,111-112,115-117,120-121,140-142,155-157,166-168,174-177,185-186,192-196,200-204,209-212,219-224,231-237,271,273-274,276,283-284,301,312,314,318,325,327,331-334,338,346-347,353-355,361-363,365-366,369,372,374,377-380,382-384,386,388-389,391,393-394,396,398-399,401,403-404,406,410-411,413,417-418,420,425,465,471-472,521-524,538,540-542,544,546-548,558,562-564,566,588
src/io/RawReader.H                             1        1   100%
src/io/TiffReader.cpp                        384      130    33%   59-65,67-69,71-73,75-77,79-80,82-84,86-88,90-92,94-96,98-99,101-103,106-108,111-112,114-117,119,122,124-127,143-144,148-150,152-158,160,186,210,217,226,228-231,240,242-245,248,255,288-293,306,309-317,319-320,323-327,331-335,338-342,344-348,351-357,359-363,367,369,375-377,379-393,396,398-402,404-409,413-418,420-425,428-429,432-434,555-575,577-578,581-588,590,593-609,612-614,670,673-674,677-683,685,689-700,702-703
src/io/TiffReader.H                            5        5   100%
src/props/BoundaryCondition.H                131       74    56%   63,68,70,216,224-229,233-236,238-244,247-249,252-253,255,258-261,264-265,271-272,274-279,285-287,290-296,299,303,365-366,371,373
src/props/ConnectedComponents.cpp             69       67    97%   94-95
src/props/ConnectedComponents.H                4        4   100%
src/props/DeffTensor.cpp                      62       59    95%   122,128-129
src/props/Diffusion.cpp                      510      378    74%   93-94,97-98,103-104,106-116,118,123-132,134-141,144-150,153-157,159-163,165,168-173,175-177,179,182-184,186-187,190-191,193,195-198,200,202-203,288-289,297-298,300,349,359-360,368-371,373-375,404-413,415,453,461,465-467,526-527,533,535,539,547,581,610,638,646,735-736,739-740,757-760,771-772,774,824
src/props/EffDiffFillMtx.H                   120      106    88%   58,216-217,221-225,229,231-235
src/props/EffectiveDiffusivityHypre.cpp      389      347    89%   189-191,193-197,305,367-370,479,612-615,617-619,621-624,633-636,643,672,684-687,689-691,693,705,716,718
src/props/EffectiveDiffusivityHypre.H          7        7   100%
src/props/FloodFill.cpp                       84       81    96%   94-95,203
src/props/HypreStructSolver.cpp              344      210    61%   87-88,121,133-134,145,299,309,311,314,346,356,358,361,367-370,372-376,378-379,381-385,388-389,391-392,394,397-398,401-402,404-407,409-413,415-416,418-422,425-426,428-429,431,434-435,438-439,441-443,445-451,453-457,460-461,463-464,466,469-470,473,475-477,479-486,488-492,495-496,498-499,501,504-505,508,510-512,514-517,519-523,526-527,529-530,532,535-536,539,542-543,556
src/props/HypreStructSolver.H                  6        6   100%
src/props/MacroGeometry.H                     17       17   100%
src/props/ParticleSizeDistribution.cpp        11       11   100%
src/props/ParticleSizeDistribution.H           6        6   100%
src/props/PercolationCheck.cpp                53       46    86%   32-33,49-51,68,73
src/props/PercolationCheck.H                   4        4   100%
src/props/PhysicsConfig.H                     90       89    98%   150
src/props/ResultsJSON.H                      225      222    98%   242,395,416
src/props/REVStudy.cpp                       151      128    84%   72,83-91,159,170-173,175,183-186,188-190
src/props/SolverConfig.H                      32       20    62%   30,32,37-44,75-76
src/props/SpecificSurfaceArea.cpp             56       55    98%   59
src/props/SpecificSurfaceArea.H                6        6   100%
src/props/ThroughThicknessProfile.cpp         38       38   100%
src/props/ThroughThicknessProfile.H            5        5   100%
src/props/Tortuosity.H                         2        2   100%
src/props/TortuosityDirect.cpp               219      191    87%   81-83,86,100-106,113-114,125,134,140,202-209,226,394,424,433
src/props/TortuosityDirect.H                   5        5   100%
src/props/TortuosityHypre.cpp                784      563    71%   148-149,154-155,239-242,245-247,310,334-336,339-340,342,352-354,357-359,389-392,572,596,600,621,637-638,640-642,644-653,655,658-662,666-668,671-678,680-684,688-690,692-694,696-705,707-711,713-724,726-729,731,741,747-750,752-754,763-766,768-770,786,789-790,813-818,829-832,834,871,876-879,882-884,888-891,893,895-898,900,905-907,909,958,967,972,975-980,996-999,1013-1017,1022-1027,1037-1041,1046-1051,1056-1060,1063-1066,1073-1076,1087,1096,1098,1102,1104,1126,1157-1158,1244-1246,1372-1375
src/props/TortuosityHypre.H                   15       15   100%
src/props/TortuosityHypreFill.H              127       98    77%   85,203,205-212,237-239,241-245,247-248,250,252,255-256,258-262
src/props/TortuosityKernels.H                 97       53    54%   52,56-60,62-65,69-74,76-80,84-85,90,129,143,157,243,245-248,250-253,257-260,262-265
src/props/TortuosityMLMG.cpp                 123        0     0%   32,37,39,41-44,46-47,49-52,54,59,62,67-68,70,75-78,80-81,84,87,89-91,94-97,99,104-112,114,116,119,122,125,128-130,140,142,152-157,163-168,174-180,183,191-196,198,200,203,206-207,210-213,215,217-221,223-224,226-227,230-231,240-243,245,256-258,260,266-268,270,275,277-280,284-285,288-289
src/props/TortuosityMLMG.H                     1        0     0%   67
src/props/TortuositySolverBase.cpp           301        0     0%   40,46-52,54-55,57,61,64,67,69-72,74-75,77,80,85-88,90-91,94-101,104,106-107,110,113,115,122-124,126-127,130,134,136-138,140,142-145,148-152,154,157,159,166-169,171,173,175-182,184-186,188-190,193-195,197,200,203,205,208,210-211,213-217,219-221,223-224,226-232,234-239,241,243-252,255,259-264,266,268-277,280,283-286,288-289,291,293-296,298,302-303,305-306,309,312-318,320,322-325,327,332-334,336-340,342-343,345-355,357-358,360-361,364-365,367-370,372-376,379-380,382-386,388,391,394-396,398,406-409,411-417,420-422,425-429,432,434-436,438-440,443,446-454,458-460,463-465,467,469-471,473-476,478,482,486-490,492,495-502,504-506,508,512-513,518-519
src/props/TortuositySolverBase.H              13        0     0%   69,84-85,87-88,90-91,99-100,102-103,105-106
src/props/VolumeFraction.cpp                  25       25   100%
src/props/VolumeFraction.H                     4        4   100%
------------------------------------------------------------------------------
TOTAL                                       5432     3532    65%
------------------------------------------------------------------------------

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